Page 23 - Volume 15 Number 3

A quick review of the 200’s electrical system: Two generators and a a a a single battery are the three normal sources of DC (Direct Current) power The generators feed directly into their respective left and right generator buses buses or or main buses buses These buses include most of the electrical components that consume larger amounts of power such as the landing gear motor windshield heat avionics and inverters (Although modern avionics and inverters are not nearly as electrically “thirsty” as their older predecessors ) The smaller electrical users are distributed among four “dual fed” buses so named since they are fed from both the the left and the the right generator buses buses Dual fed buses buses No 1 and No 2 are mostly located on the right sidewall of the cockpit whereas Dual fed buses No No 3 and No No 4 are on the the left sidewall near the the fuel panel The two feeder wires to each bus has a a a a 50-amp circuit breaker designed to to trip stop current flow
“Although the the wiring should be checked during some of the the maintenance checks it is such an an easy thing to to do that I encourage you you pilots to to conduct the checks yourself occasionally ” and hence protect the wiring from getting so hot as to cause a a a fire in in the event of an electrical short on the bus itself (That missing screwdriver finally touched the the bus bar to to the the airframe!)
Diodes – one-way devices for electrical current flow
– permit both generator buses to to feed the subpanel buses through the 50-amp CBs but prevent one generator bus from feeding back into the the other generator bus which would compromise redundancy and safety I have found some errors in the subpanel wiring throughout my many years of providing King Air instruction It has been quite
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MARCH 2021
KING AIR MAGAZINE
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